Calculating machine



Nov. 21, 1933. H. EWALD CALCULATING MACHINE Filed July 22, 1930 nu. m 3 2 w m w l 7 W \)5 6 m M L 7 W m 1 A M In rye/160T,

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patented Nov. 251 i931? l UNITED STATES PATENT OFFICE CALCULATENG MACHINE Application July 22, 1930, Serial No. 469,856, and

in Germany January 3 Claims.

My invention relates to improvements in calculating machines, and more particularly in calculating machines comprising a plurality of calculating mechanisms and mechanism for simultaneously resetting the said calculating mechai the beginning and before the end of the resetting operation the resistance is high, while in the intermediate parts of the operation it is low. The said increased resistance at the beginning and at the endof the operation is caused by the fact that, for example at the beginning of the resetting operation, a resetting shaft must be shifted in axial direction by a cam member, and at the end of the resetting opertion certain springs acting on the numeral wheels must be put under tension. See for example German Patent 118,749, the copending application of Hoffmeister No. 208,012, filed July 23, 1927 and U. s. patent to Trinks 1,022,280. In 'Hoffmeister the crank 2 serves for rotating the resetting shaft as do the cranks'2, "I, and in applicants disclosure on the resetting shaft whereas the cranks in applicants disclosure are secured to stubashafts 11, :23, and which have secured thereto toothed segments 3, 9, and 6 respectively. These segments are'geared to the gears on the respective resetting shafts of resetting mechanisms of 1, 8, and. 4. By oscillating the cranks ,2, 10, and '7 the resetting mechanisms are operated as is also done in Hoifmeister by oscillating the crank 2. The patent to Trinks also shows a similar resetting mechanism. My invention consists in so constructing and disposing the resetting mechanisms :of the calculating mechanisms that the said heavy points of the individual resetting devices are operated in succession. If for example a point of high resistance is found at the beginning of each individual resetting operation, the resetting of the second or third calculating mechanism should be started only after the point of heavy resistance of the first or second resetting mechanism hasbeen overcome. In a similar way the points of heavy resistance at the end of the resetting operation are overcome. In order to prevent simultaneous action of several points of high resistance, and to avoid excessive increase of the resetting movement of the common resetting mechanism, the elements transmitting the common resetting operation to the individual resetting devices may be constructed so that the individual resetting devices are operated at different velocities. Therefore those calculating mechanisms which can be readily reset are constructed so that the resetting operation is performed more readily than that of the calculating mechanisms having a resetting operation of high resistance.

By thus constructing the calculating machine I am enabled to provide a common resetting mechanism which does not work much heavier than a single resetting mechanism. The common resetting mechanism is constructed so that it can be operated at any tin e without reversing any mechanism, and so that it does not interfere with the individual resetting operation.

For the purpose of explaining the invention an example embodying the same has been illustrated in the accompanying drawing showing a diagrammatical sectional elevation of a calculating machine.

In the example shovvn in the drawing the calculating machine comprises a setting mechanism 8 comprising setting disks adapted to project a suitable number of teeth corresponding to the number to be entered into the calculation into operative positions and a plurality of calculating mechanisms adapted to be operated from the said setting mechanism by means of a machine crank. A machine of this type is known in the art and, for clearness sake, I have omitted from the drawing all those parts which are not directly connected with the resetting mechanism.

The main calculating mechanism 1 is mounted in the usual way on a slide 30, and it is adapted to be reset by means of a hand lever 2 and a toothed segment 3 connected therewith. In the rear part of the machine a revolutions counting mechanism 4 is located which is adapted to be reset by means of an intermediate gear wheel 5 and a toothed segment 6 connected with a hand crank 7. The setting mechanism 8 is adapted to be reset by means of a hand lever 10 through the intermediary of intermediate gear wheels 9, the said hand lever being located at the left hand side of the machine. These resetting mechanisms are known in the art.

On the shaft 11 of the hand lever 2 mounted in the slide an operating lever 12 is loosely mounted which is rigidly connected with a toothed segment 13. To the said segment a pin 14 is fixed which upon operation of the lever 12 engages an extension 31 of the lever 2 thus carrying the same along and resetting the main calculating mechanism 1.

The toothed segment 13 is in engagement with a gear wheel 15 rotatably mounted Within the casing 32 of the machine, and the gear wheel 15 is in mesh with a rack 17 shiftable within the machine casing 32. In order to insure engagement of the said gear wheels in any position of the slide the gear wheel 15 has a breadth equal to the path of the slide, or it is shiftable together with the slide longitudinally of the shaft 16, and it cooperates with a second gear wheel secured to the shaft and meshing with the rack 17. In the first-named construction the gear wheel 15 is in mesh with the rack 17. The said rack is in engagement with toothed segments 18 and 19.

The toothed segment 18 is keyed to a shaft 20, and to the opposite end and at the left hand side of the machine casing a toothed segment 21 is secured which is in mesh with a gear wheel or toothed segment 22 loosely mounted on the shaft 23 carrying the hand lever 10, and which carries a pin 24 adapted to carry along, upon rotation of the lever 12, the hand lever 10, thus resetting the setting mechanism 8. The toothed segment 19 is made integral with a toothed segment 33 meshing with a gear wheel 26 loosely mounted on the shaft 25 of the hand lever 7 and carrying a pin 2'! adapted upon operation of the lever 12 to carry along the hand lever 7 and to reset the revolutions counting mechanism 4. Thus by means of the hand lever 12 all the resetting mechanisms may be simultaneously operated, and the said common resetting mechanism does not interfere with the operation of the individual resetting mechanisms. The common resetting mechanism is constructed so that the resetting devices are operated in succession. For this purpose the pins 14, and 2? are disposed so that in their normal positions the angular distances between the same and the hand levers 2, 10 and 7 are different. The

resetting velocity of the individual resetting mechanism is made different by providing toothed seg-- ments and cooperating gear wheels of diflerent sizes.

I claim:

1. In a calculating machine, a plurality of calculating mechanisms, resetting mechanisms individual to the respective calculating mechanisms each resetting mechanism including a rock-shaft and said rocksliafts being parallel to each other, a handle on each rockshaft, an oscillatory element on each rockshaft, a driving member geared to each of said oscillatory elements for actuating them simultaneously, and pins on said oscillatory elements in unequally spaced relation to said handles for actuating the resetting mechanism successively.

2. In a calculating machine, a plurality of calculating mechanisms, resetting mechanisms individual to the respective calculating mechanisms each resetting mechanism including a rockshaft, a handle on each rockshaft, an oscillatory element on each rockshaft, a driving member geared to each of said oscillatory elements for actuating them simultaneously, and unequal lost motion connections between said oscillatory elements and said driving member for starting said resetting mechanism in succession.

In a calculating machine, a plurality of caloulating mechanisms, resetting mechanisms individual to the respective calculating mechanisms, each resetting mechanism including an impelling member, a driving member, means for moving said driving member in one direction, and lost motion connections from said driving member to each of said impelling members, the extent of lost motion in the different connections being varied to cause the resetting mechanisms to be set in operation successively.

HARRY EWALD. 

